Well, that's unfortunate because if you encounter such a purely technical problem at an online casino with unresponsive support, there is not much to do. Unfortuntely Data Team has finished reviewing the site and it is not a very convincing score. See for yourself. 👈
I suggest that you try to find alternative communication channels, such as their social media accounts.
The best approach is to bring this situation directly to their tech department, if one exists.
Or, you may ask your mobile operator whether there is some issue with getting 3rd-party short messages. I do not know in what format the message is supposed to work, but you can try the operator; describing the situation to them may help get some assurance.
However, I would reconsider playing at such a casino in the future, to be honest.
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